7-chloro-1-cyclopropyl-1,4-dihydro-8-methyl-6-nitro-4-oxoquinolone-3-carboxylic acid 、
4,4-二甲基恶唑啉 在
potassium carbonate 作用下,
以
二甲基亚砜 为溶剂,
以88%的产率得到1-cyclopropyl-1,4-dihydro-7-(4,4-dimethyloxazolidin-3-yl)-8-methyl-6-nitro-4-oxoquinoline-3-carboxylic acid